CN111926957A - Thermoplastic PVDF fluorocarbon powder coated aluminum veneer - Google Patents
Thermoplastic PVDF fluorocarbon powder coated aluminum veneer Download PDFInfo
- Publication number
- CN111926957A CN111926957A CN202010784997.XA CN202010784997A CN111926957A CN 111926957 A CN111926957 A CN 111926957A CN 202010784997 A CN202010784997 A CN 202010784997A CN 111926957 A CN111926957 A CN 111926957A
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- CN
- China
- Prior art keywords
- fluorocarbon powder
- pvdf fluorocarbon
- aluminum veneer
- aluminum alloy
- coating
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B2/00—Walls, e.g. partitions, for buildings; Wall construction with regard to insulation; Connections specially adapted to walls
- E04B2/88—Curtain walls
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
- B05D3/0218—Pretreatment, e.g. heating the substrate
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/10—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by other chemical means
- B05D3/102—Pretreatment of metallic substrates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/64—Insulation or other protection; Elements or use of specified material therefor for making damp-proof; Protection against corrosion
- E04B1/642—Protecting metallic construction elements against corrosion
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2202/00—Metallic substrate
- B05D2202/20—Metallic substrate based on light metals
- B05D2202/25—Metallic substrate based on light metals based on Al
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2502/00—Acrylic polymers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2506/00—Halogenated polymers
- B05D2506/10—Fluorinated polymers
- B05D2506/15—Polytetrafluoroethylene [PTFE]
Abstract
The invention discloses a thermoplastic PVDF fluorocarbon powder coated aluminum single plate, which comprises an aluminum alloy base plate, a passivation film and a PVDF fluorocarbon powder layer. The production process of the aluminum veneer comprises three parts, namely a sheet metal process, a pretreatment process and a spraying process, wherein the surface coating technology of the aluminum veneer adopts a 'one-coating two-baking' process, namely a pretreatment process to form a passivation film, then the passivation film is baked for 8min-10min at 60-100 ℃ to remove tap water and pure water residue on the surface of the aluminum veneer in the pretreatment process so that the aluminum veneer reaches a state suitable for spraying, and then PVDF fluorocarbon powder is sprayed and baked for 15min at 235 ℃ to be cured to obtain the aluminum veneer. The PVDF fluorocarbon powder coating is used as the surface coating of the aluminum veneer, and a new architectural decoration material product developed by the production process of one-coating two-baking has the new performances of good wear resistance, corrosion resistance, weather resistance and the like, and is more suitable for being applied to the decoration of the outer wall of coastal or offshore buildings with severe environment, high corrosivity and salt fog.
Description
Technical Field
The invention relates to a thermoplastic PVDF fluorocarbon powder coated aluminum veneer, belonging to the technical field of building decoration materials
Background
At present, the curtain wall decoration industry puts high requirements on the green environmental protection and the service life of building material products, but the downstream aluminum veneer production industry for building decoration still mainly sprays solvent type fluorocarbon paint, the pressure maintaining capability in the production process of the products is huge, in addition, although the powder spraying process which is good in recoverability and does not contain solvent is mature day by day, the currently commonly used epoxy resin and polyester powder do not have the excellent ultraviolet resistance of the fluorocarbon paint, and the products fade even for 5-6 years under long-time exposure, so that the building appearance has obvious color difference. The PVDF fluorocarbon powder is a novel coating which is formed by modification and processing on the basis of fluororesin and is mainly characterized in that the fluororesin has F-C bonds with the largest chemical bond energy, and the F-C bonds are difficult to break under the action of heat and light (including ultraviolet rays), so that the coating has super weather resistance, corrosion resistance, wear resistance and the like. If PVDF fluorocarbon powder is used in the existing powder spraying process, the developed PVDF fluorocarbon powder coated aluminum veneer has excellent weather resistance and corrosion resistance, so that the technical problem that the building appearance has obvious color difference due to the fact that powder spraying process products in the current industry are easy to fade under the irradiation of ultraviolet rays is solved, in addition, as the PVDF fluorocarbon powder does not use solvents such as benzene and xylene, the discharge amount of VOC in the production process is effectively reduced, and the environmental protection pressure is greatly relieved. Meanwhile, the cost of the PVDF fluorocarbon powder is lower than that of fluorocarbon paint and brand-new weather-resistant powder, so that the PVDF fluorocarbon powder is beneficial to market popularization, and pushes down the development of environment-friendly coatings of manufacturers, thereby promoting the ecological civilization construction of China.
The invention provides a thermoplastic PVDF fluorocarbon powder coated aluminum single plate, which is characterized in that PVDF fluorocarbon powder is sprayed on an aluminum alloy base plate subjected to a pretreatment process and is baked and cured to form a stable surface coating, so that the developed PVDF fluorocarbon powder coated aluminum single plate has good performances of weather resistance, corrosion resistance, wear resistance and the like by virtue of the excellent performance of PVDF fluorocarbon powder coating, and the performance index of the developed PVDF fluorocarbon powder coated aluminum single plate is further improved compared with that of the traditional powder sprayed aluminum single plate.
Disclosure of Invention
The invention aims to provide a thermoplastic PVDF fluorocarbon powder coated aluminum single plate aiming at the current requirements of weather resistance and environmental protection. The PVDF is modified by means of a unique structure and applied to a coating system, the PVDF not only retains the original properties after being modified, but also increases the group activity, so that the PVDF can be uniformly distributed and compatible with the coating system, the PVDF is compounded with acrylic resin, and then the functional coating is prepared from the composite material, so that the aim of improving the performances of the coating, such as good wear resistance, corrosion resistance, weather resistance and the like, on the metal surface is fulfilled.
The technical problem to be solved by the invention is realized by adopting the following technical scheme:
the invention relates to a thermoplastic PVDF fluorocarbon powder coated aluminum single plate which consists of an aluminum alloy base plate, a passivation film and a PVDF fluorocarbon powder layer.
The aluminum alloy base plate is made of 3003 series aluminum alloy plates, then required product shapes are formed through sheet metal machining processes of blanking, digital punching, bending, welding, polishing and the like, and a pretreatment process and a spraying process are sequentially performed after sheet metal machining is completed. The pretreatment process comprises the following steps: pre-degreasing and degreasing the aluminum alloy base plate by using a degreasing agent at 50-60 ℃, removing residual degreasing agent by washing with tap water at normal temperature, removing oxide by using a polishing agent at normal temperature, removing residual polishing agent by washing with tap water at normal temperature, passivating the aluminum alloy base plate by using a passivating agent at normal temperature to form a passivation film, washing away residual passivating agent by using pure water at normal temperature, baking for the first time, and baking for 8-10 min at 60-100 ℃ to remove residual clear water on the surface of the aluminum alloy base plate, so that the pretreatment process is completed; the spraying process comprises the steps of spraying diluted PVDF fluorocarbon powder coating on the surface of the aluminum alloy base layer plate which is subjected to the pretreatment process, leveling, and then baking at 235 ℃ for 15min to cure the whole plate surface coating.
The aluminum alloy base plate needs to be molded through a sheet metal process, two grinding procedures of coarse grinding and fine grinding are respectively needed before spraying to improve the roughness of a plate surface so as to improve the adhesive force of a paint film on the aluminum alloy base plate, alkali washing degreasing, acid washing oxide removal and passivation are carried out on the aluminum alloy base plate before spraying to form a passivation film with protection and powder adhesive force increasing functions, and water washing and pure water washing are carried out to remove the treatment liquid residues so that the surface of the treated aluminum alloy base plate achieves the purpose of base material corrosion prevention, and meanwhile, the treated plate surface effect can meet the requirement of PVDF fluorocarbon powder spraying so that PVDF fluorocarbon powder paint can be attached to the plate surface of the aluminum alloy base plate to the maximum extent.
The passivation film is a compact silvery-white passivation film formed on the surface of an aluminum alloy substrate plate by spraying a passivating agent, on one hand, the formed passivation film can protect the metal surface and improve the corrosion resistance of the substrate, on the other hand, the adhesion of a PVDF fluorocarbon powder layer to the aluminum substrate can be improved, and the thickness of the passivation film is 2-3 mu m.
The PVDF fluorocarbon powder layer is prepared by firstly carrying out functional modification on a PVDF material to improve the dispersibility and compatibility of PVDF in a coating system, and then compounding the PVDF and acrylic resin to prepare a functional coating, so that the novel functional coating is used for spraying an aluminum alloy base plate to improve the performances of wear resistance, corrosion resistance, weather resistance and the like, and the film thickness of the formed PVDF fluorocarbon layer is about 53 mu m.
The PVDF fluorocarbon powder spraying aluminum veneer has the beneficial effects that the PVDF material is subjected to functional modification for the first time and then is applied to the powder coating to prepare the composite functional coating, the coating is applied to the metal surface spraying to obtain the aluminum veneer with the novel material coating by adopting the technical process of one-coating two-baking, and the aluminum veneer is applied to the field of architectural decoration.
Drawings
FIG. 1 is a schematic structural view of a PVDF fluorocarbon powder coated aluminum single plate of the present invention;
in the figure, 1, an aluminum alloy base plate; 2. a passivation film; 3. PVDF fluorocarbon powder layer
Detailed Description
The invention will be further elucidated with reference to the specific embodiments and the accompanying drawings.
As shown in fig. 1, a PVDF fluorocarbon coated aluminum veneer for architectural decoration comprises an aluminum alloy base plate 1, a passivation film 2 and a PVDF fluorocarbon powder layer 3, wherein the aluminum alloy base layer 1 is 2.5mm thick or 3.0mm thick and is 3003 series aluminum alloy, the aluminum alloy base layer is made of 3003 series aluminum alloy, the aluminum alloy base layer is made to achieve a required shape through a sheet metal processing technology, and the surface to be sprayed is polished by 80-mesh abrasive paper to treat defects such as scratches, pits, indentations and the like on the surface of the plate, so that the roughness of the surface to be sprayed is increased, and the; the passivation film 2 is a dense silvery-white protection film which is formed by spraying a passivating agent on the aluminum alloy base plate in a passivation process in a pretreatment process link and has the thickness of about 2-3 microns, and can increase the corrosion resistance of the base material and the adhesive force of the PVDF fluorocarbon layer 3 on the aluminum alloy base plate 1; the PVDF fluorocarbon layer 3 is formed by spraying powder coating formed by compounding modified PVDF serving as an additive material with the powder coating, firstly, the PVDF material is subjected to functional modification to improve the dispersibility and compatibility of the PVDF in a coating system, then the PVDF and acrylic resin are compounded to prepare functional coating for spraying an aluminum alloy base plate, and finally fluorocarbon powder layers with the thickness of about 53 mu m are formed. The PVDF fluorocarbon powder coating is prepared by firstly modifying functionalization in the preparation process of the PVDF fluorocarbon powder coating, enhancing the compatibility of the PVDF fluorocarbon powder coating with other materials, then adding the modified PVDF into acrylic resin to form stable and highly dispersed fluororesin, and finally mixing the fluororesin, pigment, filler and auxiliary agent.
As shown in figure 1, the PVDF fluorocarbon powder coated aluminum veneer for architectural decoration comprises three parts, namely a sheet metal process, a pretreatment process and a spraying process, wherein the spraying process adopts a one-coating two-baking production technology, namely, after the pretreatment is finished and a chromized film is formed, the chromized film is baked for 8min-10min at 60-100 ℃ to remove tap water and pure water residues on the surface of the aluminum veneer in the pretreatment process so that the aluminum veneer is in a state suitable for spraying, then PVDF fluorocarbon powder is sprayed, and finally the aluminum veneer is cured by baking for 15min at 235 ℃. The sheet metal process comprises the working procedures of blanking, stamping, bending, welding, polishing and the like; the pretreatment process comprises the working procedures of degreasing agent pre-degreasing and degreasing, bright dipping to remove an oxide film, passivation to form a passivation film, tap water washing and pure water washing to remove solution residues, baking to remove tap water and pure water residues and the like; the spraying process comprises the working procedures of spraying PVDF fluorocarbon powder, leveling, baking and curing and the like; in the production technology of 'one coating and two baking', one coating is sprayed with a PVDF fluorocarbon powder layer, two baking is baking for 8min-10min at 60-100 ℃ after pretreatment is finished to remove tap water and pure water residues on the board surface in the pretreatment process, and the coating is cured by baking for 15min at 235 ℃ to finally finish the whole production process.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. A thermoplastic PVDF fluorocarbon powder coating aluminum veneer comprises an aluminum alloy base plate (1), a passivation film (2) and a PVDF fluorocarbon powder layer (3), and is characterized in that the production process of the aluminum alloy base plate (1) comprises a sheet metal process, a pretreatment process and a spraying process; the sheet metal technology comprises the following processes of blanking, stamping, bending, welding and polishing in sequence; the pretreatment process comprises the following steps: pre-degreasing and degreasing the aluminum alloy base plate (1) by using a degreasing agent at 50-60 ℃, removing residual degreasing agent by using tap water at normal temperature for the first time, removing oxides by using a polishing agent at normal temperature, removing residual polishing agent by using tap water at normal temperature for the second time, passivating the aluminum alloy base plate (1) by using a passivating agent at normal temperature to form a passivation film (2), removing residual passivating agent by using pure water for the third time at normal temperature, baking for the first time, and removing residual clear water on the surface of the aluminum alloy base plate by baking for 8-10 min at 60-100 ℃, wherein the pretreatment process is finished; the spraying process comprises the steps of spraying diluted PVDF fluorocarbon powder coating on the surface of the aluminum alloy base plate (1) subjected to the pretreatment process, leveling, and then baking at 235 ℃ for 15min to cure the whole plate surface coating.
2. The thermoplastic PVDF fluorocarbon powder coated aluminum veneer as claimed in claim 1, wherein the passivation film (2) is formed in the passivation process in the pretreatment process of the aluminum veneer, and the specific mode is that a suspended metal substrate plate is sprayed with a passivating agent to form a uniform, dense and silvery white passivation film (2) on the surface of the suspended metal substrate plate.
3. The thermoplastic PVDF fluorocarbon powder coated aluminum veneer as claimed in claim 2, wherein the thickness of the passivation film (2) is 2-3 μm.
4. The aluminum veneer coated with thermoplastic PVDF fluorocarbon powder as recited in claim 1, wherein said PVDF fluorocarbon powder coating is a dispersion and functional stable powder coating prepared by compounding modified PVDF with acrylic resin and compounding with pigments, fillers and other additives.
5. The aluminum veneer coated with thermoplastic PVDF fluorocarbon powder as recited in claim 1, characterized in that said aluminum alloy substrate plate (1) is 3003 series aluminum alloy plate.
6. The thermoplastic PVDF fluorocarbon powder coated aluminum veneer according to claim 1, characterized in that the thickness of the PVDF fluorocarbon powder layer (3) is about 53 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010784997.XA CN111926957A (en) | 2020-08-06 | 2020-08-06 | Thermoplastic PVDF fluorocarbon powder coated aluminum veneer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010784997.XA CN111926957A (en) | 2020-08-06 | 2020-08-06 | Thermoplastic PVDF fluorocarbon powder coated aluminum veneer |
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| CN111926957A true CN111926957A (en) | 2020-11-13 |
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| CN202010784997.XA Pending CN111926957A (en) | 2020-08-06 | 2020-08-06 | Thermoplastic PVDF fluorocarbon powder coated aluminum veneer |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101596519A (en) * | 2009-07-02 | 2009-12-09 | 许浩洪 | A kind of technology in section bar surface spray mo(u)lding fluorine carbon wood grain |
| CN105153887A (en) * | 2015-07-30 | 2015-12-16 | 安徽荣达阀门有限公司 | Wear-resistant valve antifouling powdery paint and manufacturing method thereof |
| US20170233583A1 (en) * | 2014-12-05 | 2017-08-17 | Asahi Glass Company, Limited | Coating film repair method and coated product |
| CN107245273A (en) * | 2017-07-06 | 2017-10-13 | 上海博丽铝幕墙材料制造有限公司 | A kind of fluorine carbon dust powder formulation and preparation method and spraying coating process based on aluminum veneer |
| CN107474653A (en) * | 2017-09-15 | 2017-12-15 | 立昌科技（赣州）有限公司 | A kind of high-performance PVDF fluorocarbon powder paints and preparation method thereof |
| CN108047836A (en) * | 2017-12-29 | 2018-05-18 | 广东华江粉末科技有限公司 | A kind of extra-weather-proof PVDF double layer of powder coating and preparation method thereof |
| CN108659638A (en) * | 2018-04-26 | 2018-10-16 | 中山市凯德美氟碳新材料有限公司 | Aluminium veneer curtain wall fire prevention fluorocarbon powder paint and preparation method thereof |
-
2020
- 2020-08-06 CN CN202010784997.XA patent/CN111926957A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101596519A (en) * | 2009-07-02 | 2009-12-09 | 许浩洪 | A kind of technology in section bar surface spray mo(u)lding fluorine carbon wood grain |
| US20170233583A1 (en) * | 2014-12-05 | 2017-08-17 | Asahi Glass Company, Limited | Coating film repair method and coated product |
| CN105153887A (en) * | 2015-07-30 | 2015-12-16 | 安徽荣达阀门有限公司 | Wear-resistant valve antifouling powdery paint and manufacturing method thereof |
| CN107245273A (en) * | 2017-07-06 | 2017-10-13 | 上海博丽铝幕墙材料制造有限公司 | A kind of fluorine carbon dust powder formulation and preparation method and spraying coating process based on aluminum veneer |
| CN107474653A (en) * | 2017-09-15 | 2017-12-15 | 立昌科技（赣州）有限公司 | A kind of high-performance PVDF fluorocarbon powder paints and preparation method thereof |
| CN108047836A (en) * | 2017-12-29 | 2018-05-18 | 广东华江粉末科技有限公司 | A kind of extra-weather-proof PVDF double layer of powder coating and preparation method thereof |
| CN108659638A (en) * | 2018-04-26 | 2018-10-16 | 中山市凯德美氟碳新材料有限公司 | Aluminium veneer curtain wall fire prevention fluorocarbon powder paint and preparation method thereof |
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Application publication date: 20201113 |